Yes, 3 concurrent streams. 5 sub accounts with 3 concurrent streams. My kids watch my YouTubeTv from their homes.
My daughter uses my YoutubeTV at her apartment at school. Has her on sub account with it's own DVR. She can customize channels as well and hide the stuff she doesn't watch. I can hide all the Disney and kid stuff I don't watch.
We use it on vacation as well via a Roku. No need to switch locations or anything like that. If you watch on your phone or tablet away from your usual local area, it will automatically use your location to give you locals where you are viewing. Nice little feature on the road to watch local news.
I love Youtube TV and even with the $15 bump it is cheaper than what I was paying for DirecTV (Genie and 3 clients plus same channels). The only channel YoutubeTV doesn't have after this update, that I care about, is the History Channel. I will keep Philo for that ($20 a month, was using it for History, Paramount, MTV, and a few others that Youtube picked up)
Lastly, you can watch Regular Youtube originals, like Cobra Kai with a YoutubeTV subscription as well.
All total Internet, YoutubeTV, and Philo I'm at $165 a month. I was more than that at one time with DirecTV not counting internet.